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Assemblies of already-certified ATEX equipment require the system integrator to compile a technical file and assess the various sub-assemblies and certified products together. Notified Body services are not required under ATEX unless the assembly has been modified from its original certified design or it incorporates certified ‘U-type’ components, which must be re-assessed in the final ‘equipment’ application. However, even under the voluntary route, increasingly end users and plant operators require a third party verification of the compliance of such assemblies to international standard and recognised codes of practice.

Accredited certification bodies such as DNV GL can provide third party assessment and certification for such assemblies on a voluntary basis to provide assurance that recognised best practice has been employed in the selection and construction of the assembly.

For applications where ATEX or IECEx Unit Verification is required, DNV GL perform a full evaluation of component parts according to the appropriate international standards and codes of practice to issue a Certificate of Conformity.